The units of Manganese Plus available for sale during the year were as follows: Mar. 1 June 16 Nov. 28 Inventory 22 units @ $32 Purchase 29 units $33 Purchase 45 units $35 96 units $704 957 1,575 $3,236 There are 12 units of the product in the physical Inventory at November 30. The periodic inventory system is used. Round answers to the nearest whole dollar a. Determine the wwertory cost by the Fro method. b. Determine the inventory cost by the Liro method. ermine the wentory cost by the average cost methods